Leatherboard felt



Patented June 16, 1925.

FRANKLIN V. CHATTEY, OF BOSTON, MASSACHUSETTS, ASSIGNOR T0 CHATON FIBRE COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

LEATHER/BOARD FELT.

Nb Drawing To all whom it mayconcern:

Be it known that I, FRANKLIN V. CHANEY, a citizen of the United States,- residing at Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and-useful Improvements in Leatherboard Felt; and I do hereby declarethe following to be a full, clear, and exact description of the invention such as Will enable others skilled in the art to which it appertains to make and use the same.-

The present invention relates to an improvement in leatherb-oard felt.

The object of the invention is to produce a compressible, resilient felt adapted for use in the manufacture of dust guards for railway car axle boxes, and for other purposes, at a low cost:

Heretofore dust guards have very generally been made of Wood, but such dust guards have been unsatisfactory owing to their frequent breakage and their inefficiency as dust guards. It has been proposed to use hair felt for dust guards, but such a dust guard is expensive and the interstitial spaces being large ordinarily supply an excess of oil to the axle. I

The present invention consists of a leatherboard felt preferably made on a paper making machine of the type known as the wet machine, comprising' 40% leather fibre, 20% mixed paper fibre pr paper pulp, and 30% goat or cow hair or other form of coarse animal or vegetable fibre, and 10% binder. The material is manufactured according to the ordinary paper board process. The coarse fibre is put in the beater after the leather fibre and paper fibre are beaten up to a proper degree of fineness. The binder is addedto the contents of the beater, resin size first being beaten in until it is thoroughly mixed throughout the mass, whereupon aluminum sulphate is added to precipitate the resin size in the form of a sodium resinate. The felt is made from the stock thus.

prepared on the usual paper machine in the usual manner with this exception, that the pressure of the make roll. employed is less than that ordinarily employed in making.

leatherboard, and more than that employed in making the felt described in the Clapp Patent No. 1,427 ,263, dated August 29,1922. (The proportions of the ingredients may be varied somewhat. Thus, the leather fibre 1923. Serial No. 623,749.

may .be increased from 40% to when it.

is desired toproduce a felt having smaller interstitial spaces. The paper pulp ingre client may be as low as 15% or as high as I 1,541,922 UNITED STATES PATENT oFncE.

25%. The coarse fibre constituent may be increased when it is desired to increase the interstitial spaces of the felt. The felt that forms the subject of this invention is a compressible, resilient felt board, the voids or interstitial spaces of which are such as to enable it to conduct and lift by capillarity the required amount of oil for dust guard purposes. When the felt is to be used for other purposes, or in cases where a lesser or greater capacity to lift the oil by'capillarity is desired, the proportions of the ingredients may be changed as above set forth. The

binder stifle-us and gives rigidity to the product, which otherwise Would be a soft, almost flocculent, lightly adherent mass of small" tensile strength and so weak as to be easily broken in handling. The binder contributes to the value of the product for use as a dust. guard material by reason of its reduction of the interstitial spaces while at the same time maintaining a vigorous, stiff felt.

A mixture of leather fibre and paper fibre alone produces too firm a product having voids or interstitial spaces too small to fill the requirements of a dust guard, but the present leather-board felt is desirable because it permits the capillary absorption of the oil for the purpose of lifting the oil from self-supporting,

the bottom of the journal box to the journal.

Such leatherboard would not be satisfactory material for use in the manufacture of dust guards.

lWit-h the present prices of leather fibre and waste paper from $10. to $15. per ton, and cow or goat hair from $80. to $120. per ton, it is apparent that this product can be made very cheaply, and this is an extremely important feature of the present invention.

Having thus described the invention, what is claimed is: p 1. A leatherboard felt comprising 40% leather fibre, 20% mixed paper fibre, 30% coarse animal or vegetable fibre, and 10% binder. I

2. A resilient felt suitable for dust guards for railway car axle boxes susceptible of compression in thickness by moderate resinterstitial oil conducting 3. A resilient felt suitabl spaces. e for dust guards for railway car axle boxes susceptible of compression in thickness b y moderate pressure, comprising from 40% to 50% leather fibre, from to paper fibre, from to coarse animal or vegetable fibre, in which the animal or vegetable fibre operates to distend the leather and paper fibre and form interstitial oil conducting spaces.

FRANKLIN V. GHANEY. 

